Rc +Vcc RC Pa o Rc Rc vo Pa O CEE Ucm 2REE CEE REE (c) -VEE Figure 17.48 (a) Bipolar differential amplifier; (b) its differential-mode half-circuit; and (c) its common-mode half-circuit.

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(a) The transistors in the differential amplifier as shown are biased at a collector current of 18 μA, and RC = 430 kΩ. The transistors have fT = 75 MHz, Cμ = 0.5 pF, and rx = 500 Ω. What is the bandwidth of the differential amplifier? (b) Repeat if the collector current is increased to 50 μA and RC is reduced to 140 kΩ.

Rc
+Vcc
RC
Pa o
Rc
Rc
vo
Pa O
CEE
Ucm
2REE
CEE
REE
(c)
-VEE
Figure 17.48 (a) Bipolar differential amplifier; (b) its differential-mode half-circuit; and (c) its common-mode half-circuit.
Transcribed Image Text:Rc +Vcc RC Pa o Rc Rc vo Pa O CEE Ucm 2REE CEE REE (c) -VEE Figure 17.48 (a) Bipolar differential amplifier; (b) its differential-mode half-circuit; and (c) its common-mode half-circuit.
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